Typewriting machine



Oct. 22, 1940. J. KRUGER TYPEWRITING MACHINE Filed May 23, 1939 Patented Oct. 22, 1940 UNITED STATES PATENT OFFICE- mawm'rme MACHINE Johannes Kriiger, Eri'urt, Germany, assignor to Olympia Buromaschinenwerke A. G., Eri'urt, Germany, a corporation of Germany Application May 23, 1939, Serial No. 275,261

Germany June 24:, 193'! 2 Claims.

This invention relates improvements in typewriting machines and particularly to an improved type action therefor.

The invention relates more particularly to typewriters of low and flat construction and a primary object thereof is to provide a simple type action lever system which will serve also to retain the type bars in a position of rest.

In carrying out the invention, the type bars are pivotally mounted in an inclined low positioned segment and bearings for intermediate levers of the key action are located on vertically spaced lines parallel to the axis of the paper roller and the levers and connections with the type barsare arranged in such a manner that with the parts in the position of rest, the arm oi. each intermediate lever connected by a pull rod to the achieved with a minimum of structural-changes.

Other objects and advantages of the invention will be apparent from the following detailed description and uponreference to the accompanying drawing which illustrates a preferredconstructional embodiment of the invention and inwhich,

Fig. 1 is a sectional view through a typewriter embodying the invention, showing the parts of the type action in various positions,

Fig. 2 is a front elevation of the improved bearing bridge for the intermediate levers, and

Fig. 3 is an end view thereof.

Referring more particularly to the accompanying drawing, the type bars 5 are mounted in slots 6 of an inclined segment 1. The segment 1 is mounted low and in inclined position with respect to the roller platen 8. The heel portions of the type bars are pivoted in the slots 6 of the segment 1 by a pivot rod 9 and in the position of rest lie in a forwardly inclined position supported at their outer ends by a head rest l0.

, The key levers II are pivoted at their rear ends on a shaft l2 and are guided in a vertical path by a guide comb l3 which includes also astop It to limit upward movement of the key levers in the position of rest to which they are resiliently biased by tensile springs IS.

The type action connections between the-key levers H and type. bars 5 include intermediate levers arranged in groups transversely of. the machine, there being two end groups and a central group disposed on vertically spaced parallel axes, the end groups being located on the higher axis. The intermediate levers l6 of the central group are mounted in slots I 1 formed in the lower edge of a transverse bridge member Hi, the intermediate levers |6 being fulcrumed on a pivot rod l9 extending lengthwise of the rail and intersecting the slots ll. 1

The pivotal axis of the intermediate levers I6 is closer toone end thereof than to the other and 10 the free end of the long rear arm tl'iereoi is connected by a pull rod 2| to the heel of the type bar 5 at a point 22 which point in the position of rest is disposed below and rearwardly of the pivot 9. The end of the forwardly extending short 15 arm 23 01 the intermediate lever I6 is connected to the key lever II by a depending link 24.

The parts are arranged so that in the rest posi-. tion the pivot point 25 between. the rear arm 2.

of the intermediate lever |6 and the pull rod 2| 20 assumes a position beyond the line between the pivot points 9 and I9 and with the arm I9 and pull rod 20 disposed nearly parallel with the key lever.-

prevented by arranging the parts so that as the type lever returns to the rest position, the intermediate lever arm 20 and pull rod 2| assume an extended position in longitudinal alignment with each other, such an arrangement would not pr'e- 3o vent rebound of the key lever from its stop. In order to'prevent translation of the rebound movement of the key lever into movement of the type bar, the connections are arranged so that upon normal rebound of the key lever, the pivot point 25 will not be moved across the centerline C between the pivots 9 and Is, at which point motion would be imparted to the type bar. Thus, with the pivot 25 located beyond the centerline C, the

rebound motion of the type bars and key levers 40 will be mutually repulsive.

In order that the intermediate levers I611 01 the end groups associated with. the type bars 511 mounted adjacent the ends of the segment 1 may be disposed in substantially the same relative position with respect to the type bars and key levers associated therewith as are the levers IS, the intermediate levers Ilia of the end groups are mounted in slots 26 provided in the top of the rail I8. The intermediate levers |6a of the end 20a and 23a connected by pull rods 2m to the Although rebound of the type lever would be 25 type bars In and to associated key levers by links Ila, The amount of vertical displacement between the pivot shafts l9 and 21 is preferably not as great as the displacement between the pivot points 9 and 8a of the center and end type bars mounted in the segment I.

, Referring more particularly to the transverse bearing bridge member I! shownin Fig. 2, the latter comprises a long straight rail relatively flat in cross-section and disposed on edge with its flat sides vertical. The rail is provided at opposite ends with flanges or ears 2! to facilitate moimting thereof between the sides of the machine frame, securing holes 29 being provided in these flanges for suitable fastening elements. There are sixslots 26 formed in the upper edge of the rail ll adjacent each end for the reception of the intermediate levers of the end groups associated with the corresponding end groups of type bars of the type segment. For the remainder of the length of the rail II the slots II are formed in the bottom edge thereof for the reception of the central group of intermediate levers'associated with the intervening type bars. The pivot shafts l9 and 21 upon which the intermediate levers are mounted preferably extend from end to end of the rail.

The bearing bridge could be formed of solid metal with the slots cut therein or could be formed by a pressing operation with the slots pressed in at the one operation as desired.

' While. a preferred embodiment of the invention has been shown and described by way of illustration it is to be understood that modifications of the details of construction may be resorted to without departing from the spirit of the invention within the scope of the appended claims.

, Iclaim:

1. In a typewriter of flat construction, in combination, a paper roller, a rearwardly inclined type bar segment mounted forwardly of said paper roller with the upper edge thereof at substantially the same elevation as the axis of said roller, a plurality of type bars pivotally mounted on said segment, a straight transverse bearing bridge rail mounted forwardly of said type bar segment and disposed substantially parallel to the axis of said paper roller at a height intermediate the upper and lower extremities of said type bar segment, a plurality of key levers, operating connections between said key levers and said type bars comprising a plurality of two-armed levers pivotally mounted on said bearing bridge 'rail along the length thereof, pull rods connected between one arm of said two-armed levers and said type bars and links connected between the other arm of said two-armed levers and said key levers, said bearing bridge rail being formed for a por- 0 tion of its'length adjacent each end with a plurality of slots in the upper edge thereof providing a plurality of upstanding webs, a pivot rod extending through said webs parallel to the axis of said rail on which pivot rod the two-arma levers associated with the end type bars on said segment are mounted, said bearing bridge rail being formed along the portion of its length intermediate the slots in its upper edge with a plurality of slots in the lower edge thereof providing a plurality of depending webs, a pivot rod extending through said depending webs on which pivot rod the two-armed levers associated with the intermediate type bars on said segment are mounted, each of said two-armed levers having a positionof rest in which the arm thereof connected with a type bar extends substantially in the direction of the pivot point of its associated type bar, the connection between each two-armed lever and its associated pull rod being disposed .when in the position of rest beyond a line drawn between the axis of the lever and the point of.

- members, a plurality of depending parallel web members formed on the lower side of said rail along the portion of the length thereof intermediate the innermost of said upstanding web members, a pivot rod extending through said depending webmembers, connections between said key levers and said type bars including a plurality of two-armed levers comprising end groups and a central group, a pull rod connecting the rear arm of each of said two-armed levers to the heel of an associated type bar and a link connecting the front arm thereof to an associated key lever, the end groups of said two-armed levers being mounted respectively between the upstanding web members at oppodte ends of said transverse rail on the pivot rod extending therethrough and being connected to those type bars adjacent the ends of said type bar segment, the central group of said two-armed levers being mounted between the depending web members on the lower side of said rail on the pivot rod extending therethrough andbeingoonnectedtothosetypebarsinthe central portion of said type segment, the rear arm of each of said two-armed levers in the position of rest extending substantially in the direction of the pivot of its associated type bar and with the point of connection of said pull rod therewith moved to a position beyond the centerline between the axis of the two-armed lever and the point of connection of said pull rod tosaid type bar. u

JOHANNES KRUGER. 

